Login problems with Kindle tablet

Yes, the username field is case sensitive. Some folks have a problem because some browsers automatically capitalize the first word, and it won't allow them to login if their username wasn't capitalized when they set it up.

Thanks Doug, you helped me with my process of finding it was the browser. I had an all lowercase version of this username for a different site. The browser autocompleted it with the lowercsse version even though I did not select it. I just cleared all the saved passwords and Voila! Now then.. about that ultra high molecular weight polyethylene dental floss..